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Jia J.,National Engineering Laboratory for Vacuum Metallurgy | Jia J.,Key Laboratory for Nonferrous Metals Vacuum Metallurgy of Yunnan Province | Jia J.,Kunming University of Science and Technology | Xu B.,National Engineering Laboratory for Vacuum Metallurgy | And 11 more authors.
JOM | Year: 2013

Preparation of Ti powders from TiO2 by calcium vapor reduction was investigated by x-ray diffraction (XRD), scanning electron microscope (SEM), element analysis instrument, inert gas fusion-infrared absorption spectroscopy, and ethylene diamine tetraacetic acid (EDTA) complex formation titration. The experimental results indicate that the reduction reaction occurs very rapidly when the mass ratio of CaCl2 to TiO2 is 1:2 from 0 min to 30 min, and the titanium suboxides were further reduced from 30 min to 480 min at 1000 C. The content of CaCl2 influences the reduction products and the reduction rate obviously, and the suitable mass ratio of CaCl2 to TiO2 is 1:2 under these experimental conditions. Ti powders with oxygen content of 1000 ppm, nitrogen content of 120 ppm, and chlorine content of 80 ppm were obtained at 1000 C for 360 min. © 2013 TMS. Source


Wan H.,National Engineering Laboratory for Vacuum Metallurgy | Wan H.,Key Laboratory for Nonferrous Metals Vacuum Metallurgy of Yunnan Province | Wan H.,Kunming University of Science and Technology | Xu B.,National Engineering Laboratory for Vacuum Metallurgy | And 11 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2012

A novel technique was developed to produce metal Ti by calciothermic reduction of TiO 2 in vacuum. The impacts of the reaction conditions, including the reactions of the metal Ca with O 2, N 2, and TiO 2, pretreatment of TiO 2 powder, and reduction time and products, on quality of the Ti metal powder were evaluated with X-ray diffraction, energy dispersive spectroscopy, and scanning electron microscopy. The experimental results show that the newly-developed technique is feasible to produce high quality Ti metal powder (98.64% pure, 25~30 μm in grain size), under optimized conditions: a reduction temperature of 1273 K, a pressure of 30~40 Pa, and a reduction time of 6 h. The calciothermic reduction processes and thermodynamics calculation were also briefly discussed. Source

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